Download Shear bond strength of orthodontic color

Dent Res J (Isfahan). 2015 May-Jun;12(3):265-70.
Shear bond strength of orthodontic color-change adhesives
with different light-curing times.
Bayani S1, Ghassemi A2, Manafi S3, Delavarian M1.
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Abstract
BACKGROUND:
The purpose of this study was to evaluate the effect of light-curing time on the shear bond strength
(SBS) of two orthodontic color-change adhesives (CCAs).
MATERIALS AND METHODS:
A total of 72 extracted premolars were randomly assigned into 6 groups of 12 teeth each. Subsequent
to primer application, a metal bracket was bonded to the buccal surface using an orthodontic
adhesive. Two CCAs (Greengloo and Transbond Plus) were tested and one conventional light-cured
adhesive (Resilience) served as control. For each adhesive, the specimens were light-cured for two
different times of 20 and 40 s. All the specimens underwent mechanical testing using a universal
testing machine to measure the SBS. Adhesive remnant index (ARI) was used to assess the remnant
adhesive material on the tooth surface. All statistical analyses were performed using SPSS software.
The significance level for all statistical tests was set at P ≤ 0.05.
RESULTS:
The SBSs of the tested groups were in the range of 14.05-31.25 MPa. Greengloo adhesive showed
the highest SBS values when light-cured for 40 s, and Transbond Plus adhesive showed the lowest
values when light-cured for 20 s. ARI scores of Transbond Plus adhesive were significantly higher
than those of controls, while other differences in ARI values were not significant.
CONCLUSION:
Within the limitations of his study, decreasing the light-curing time from 40 to 20 s decreased the SBS
of the tested adhesives; however, this decline in SBS was statistically significant only in Transbond
Plus adhesive.
KEYWORDS:
Adhesive system; bond strength; dental adhesive; light curing; orthodontic bonding; shear
bond strength
PMID: 26005468 [PubMed]
PMCID: PMC4432611
Free PMC Article